For regression test, add srs-bench to 3rdparty

trunk/3rdparty/srs-bench/vendor/github.com/pion/stun/uattrs.go

@@ -0,0 +1,63 @@
+package stun
+
+import "errors"
+
+// UnknownAttributes represents UNKNOWN-ATTRIBUTES attribute.
+//
+// RFC 5389 Section 15.9
+type UnknownAttributes []AttrType
+
+func (a UnknownAttributes) String() string {
+	s := ""
+	if len(a) == 0 {
+		return "<nil>"
+	}
+	last := len(a) - 1
+	for i, t := range a {
+		s += t.String()
+		if i != last {
+			s += ", "
+		}
+	}
+	return s
+}
+
+// type size is 16 bit.
+const attrTypeSize = 4
+
+// AddTo adds UNKNOWN-ATTRIBUTES attribute to message.
+func (a UnknownAttributes) AddTo(m *Message) error {
+	v := make([]byte, 0, attrTypeSize*20) // 20 should be enough
+	// If len(a.Types) > 20, there will be allocations.
+	for i, t := range a {
+		v = append(v, 0, 0, 0, 0) // 4 times by 0 (16 bits)
+		first := attrTypeSize * i
+		last := first + attrTypeSize
+		bin.PutUint16(v[first:last], t.Value())
+	}
+	m.Add(AttrUnknownAttributes, v)
+	return nil
+}
+
+// ErrBadUnknownAttrsSize means that UNKNOWN-ATTRIBUTES attribute value
+// has invalid length.
+var ErrBadUnknownAttrsSize = errors.New("bad UNKNOWN-ATTRIBUTES size")
+
+// GetFrom parses UNKNOWN-ATTRIBUTES from message.
+func (a *UnknownAttributes) GetFrom(m *Message) error {
+	v, err := m.Get(AttrUnknownAttributes)
+	if err != nil {
+		return err
+	}
+	if len(v)%attrTypeSize != 0 {
+		return ErrBadUnknownAttrsSize
+	}
+	*a = (*a)[:0]
+	first := 0
+	for first < len(v) {
+		last := first + attrTypeSize
+		*a = append(*a, AttrType(bin.Uint16(v[first:last])))
+		first = last
+	}
+	return nil
+}